<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
        class Header extends React.Component{
            render(){
                return <h1>我是头部</h1>
            }
        }
        class Content extends React.Component{
            render(){
                return <p>我是内容</p>
            }
        }
        class App extends React.Component{
            render=()=><div>
                <Header></Header>
                <Content />
                </div>
        }
        ReactDOM.createRoot(document.getElementById("app")).render(<App />);
        </script>
</body>
</html>